Cooling fin for ramming devices



Sept. 27, 1955 K. HAAGE ETAL coouuc FIN FOR RAMMING mzvzcss Filed Feb. 19, 1952 INVENT RSI KoHRAD HAAGE 5: EBERHARD DORHFELD 2,718,884 COOLING FIN non nnvrcns Konrad Haage, EsslingemKimmichsweiler, and Eberhard Dornfeld, Esslingen (Neckar), Germany y; =Application'February 1'9, 1952,.Seria1 No. 272,442 Claims prior ty, appl c i n G nnany Feb u y 1 951 g 7 2 Glaims; (Cl. 123-4154) which they are subjectedduring the operation of a combustion engine forming part of and driving a ramming devicet Evenif thecooling fins are arranged in'the direction of" the heaviest jolts, i. e. parallel to the direction of movement of the ram, the cooling fins of ramming devices break frequently. If the cooling fins are arranged longitudinally in ramming devices in which the cylinder of the combustion engine is part of the ramming device, they offer some resistance against vertical stress. However, in ramming devices also horizontal oscillations are produced which cause the cooling fins to oscillate about their supporting bases. Horizontal oscillation of that type sooner or later results in breaking of the cooling fins.

It is the object of the present invention to provide cooling fins which offer resistance against oscillations in horizontal direction.

It is another object of the present invention to provide channel-shaped cooling fins on a cylinder, constituting together with the surface of the cylinder chimney-like air passages.

It is a still further object of the present invention to inject exhaust gases of a combustion engine driving the ramming device into the chimney-like passages formed by the channel-shaped cooling fins in order to accelerate passage of cooling air therethrough.

With these objects in view the present invention mainly consists in a plurality of channel-shaped cooling fins which are secured to the outer surface of a cylinder of a combustion engine, which may form a part of and drive a ramming device. along the longitudinally extending edge portions thereof against the outer surface of the cylinder of the combustion engine so that each cooling fin is rigidly supported against transversal oscillations by a broad supporting basis. Since the cooling fins according to the present invention face the outer surface of the cylinder with their channel-shaped face, a passage is formed between the cylinders and each cooling fin. During normal operation of a combustion engine forming part and driving a ramming device the cylinder of the combustion engine is arranged substantially vertical, and consequently the passages formed by the channel-shaped cooling fins function as chimneys for conveying air heated on the surface of the cylinder in upward direction. Also, air is forced by a transversely projecting ramming head into the passages defined by the cooling fins when the cylinder and ramming head approach each other.

According to a preferred embodiment of the present invention ducts are provided in the wall of the cylinder which extend in upward direction from the interior of the cylinder to each of the chimney-like passages formed Each channel-shaped cooling fin abuts Patented Sept. 27, 1.955

by the cooling fins according to the present invention.

best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a longitudinal sectional view through a cylinder of a combustion engine provided with cooling fins according to the present invention; and

Fig. 2 is a cross-sectional view on line 2-2 of Fig. 1.

Referring now to the drawings, 2 is the cylinder of the combustion engine in which a piston 2' is reciprocated for driving the ram 2 which has a projecting ramming head extending transversely beyond the cooling fins 1. A plurality of parallel elongated channel-shaped cooling fins 1 are secured to the outer surface of the cylinder '2 for instance by Welding. According to the embodiment "shown in the drawings, the channel-shaped cooling fin has a V-shaped cross-section, but it will be obvious to anyone skilled in the art that cooling fins may be used which have a semi-circular or otherwise curved crosssection. However, in order to assure a transversal rigidity of the cooling fins, the longitudinally extending edges of the channel-shaped fins according to the present invention are spaced apart and abut against the outer surface of the cylinder in order to provide a rigid support for the cooling fin by which transversal oscillations are effectively prevented. During ramming reciprocation, the cylinder 2 approaches the ramming head so that air is forced into the passages defined by the cooling fins.

The cylinder 2 is provided with inclined ducts 3 connecting the interior of the cylinder 2 with each of the cooling fins 4, and arranged adjacent to the upper end of the cylinder and of the cooling fins. Exhaust gases passing through the channels 3 and through the upper portion of the cooling fins will tend to create a vacuum within the channel formed by the cooling fins whereby the movement of the cooling air from the lower end of the cooling fin to the upper end of the cooling fin is accelerated and the cooling action is improved. Ribs 4 may be provided within the cooling fins partitioning the chimney-like passage formed by the same. Since the ribs 4 are arranged in the path of the exhaust gases passing through the channels 3 the injector action of the exhaust gases is considerably improved.

It will be understood that each of the elements described I above, or two or more together, may also find a useful application in other types of cooling fins differing from the types described above.

While the invention has been illustrated and described as embodied in a channel-shaped cooling fin having a V-shaped cross-section, it is not intended to be limited What is claimed as new and desired to be secured by Letters Patent is:

1. A combustion engine cooling arrangement, comprising in combination, a substantially vertically arranged combustion cylinder formed with a plurality of upwardly extending spaced ducts arranged along a circle around the perimeter of said cylinder and connecting the interior of said cylinder with the outer surface thereof; and a plurality of parallel spaced elongated channel-shaped cooling fins secured to said outer surface of said cylinder, each of said cooling fins arranged over one of said ducts and having two. parallel longitudinally extending edges abutting against said outer surface of said cylinder on either side of one of said ducts, each of said channel-shaped cooling fins constituting together with said outer surface of said cylinder a chimney-like passage, passing of air through said passages being accelerated by the injector action of exhaust gases entering through said ducts into said chimney-like passages.

2. A combustion engine cooling arrangement, comprising in combination, a combustion cylinder formed with a plurality of spaced ducts arranged around the perimeter thereof equally spaced from one end of said cylinder, each of said ducts having an inner port located on the inner surface of said cylinder, said outer ports being located nearer to said end of said cylinder than said inner ports; a plurality of parallel spaced elongated channel-shaped cooling fins having a V-shaped crosssection and secured to the outer surface of said cylinder, each of said cooling fins arranged over one of said outer ports and including two longitudinally extending edge portions having two parallel longitudinally extending edges abutting against said outer surface of said cylinder on either side of one of said ducts, each of said channelshaped cooling fins constituting together with said outer surface of said cylinder a chimney-like passage; and at least one partitioning rib located in each of said chimneylike passages nearer to said end of said cylinder than the outer port located in said chimney-like passage, each of said ribs secured at each end thereof to the inner face of one of said leg portions of the corresponding cooling fin, passing of air through said passages being accelerated by the injector action of exhaust gases entering through said ducts into said chimney-like passages and being divided by said partitioning ribs.

References Cited in the file of this patent UNITED STATES PATENTS 927,075 Reid July 6, 1909 1,235,725 Power Aug. 7, 1917 1,533,810 Ricker Apr. 14, 1925 FOREIGN PATENTS 20,067 Great Britain of 1902 27,161 Great Britain May 31, 1913 

